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Correlation between test temperature, applied load and wear transition of Mg97Zn1y2 alloy

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Journal of Magnesium and Alloys 2021年第2期9卷 592-603页

作者： J.An y.X.Tian C.Q.feng Key Laboratory of Automobile Materials Ministry of EducationDepartment of Materials Science and EngineeringJilin UniversityChangchun 130025PR China

Dry sliding wear tests were performed on Mg97 Zn1 y2 alloy at various temperatures of 20,50,100,150 and 200°C using a pin-on-disc wear testing machine in order to reveal mild-severe(M-S)wear transition mechanism during elevated-temperature wear *** was shown that at each test temperature,the wear rate increased with increasing load,and all wear rate-load curves demonstrated two distinct stages *** and severe wear *** predominant wear mechanisms operating in mild and severe wear stages were analyzed,and they were indicated in the mild and severe wear regimes of a wear mechanism transition map,respectively.M-S wear transition mechanism was analyzed by comparison of microstructure transformation and hardness change in subsurfaces of samples tested in mild and severe wear stages,from which M-S wear transition mechanism was confirmed as softening of surface material arising from dynamic recrystallization(DRX)microstructure *** M-S wear transition load was found to have a linear relationship with test temperature,and decreased with rising test temperature.M-S wear transition obeyed a critical surface DRX temperature(SDT)criterion under given conditions,and the transition loads were estimated at various test temperatures by using the criterion.

关键词： Mg-alloys Elevated temperatures Wear rate Wear mechanism Wear transition

Peri-centrosomal localization of small interfering RNAs in C. elegans

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Science China Life Sciences 2025年

作者： Qile Jin Xuezhu feng Minjie hong Ke Wang Xiangyang Chen Jiewei Cheng yan Kuang Xiaoyue Si Mingjing Xu Xinya huang Shouhong Guang Chengming Zhu Department of Obstetrics and Gynecology The First Affiliated Hospital of USTC The USTC RNA Institute Hefei National Research Center for Physical Sciences at the Microscale School of Life Sciences Division of Life Sciences and Medicine Biomedical Sciences and Health Laboratory of Anhui Province University of Science and Technology of China School of Basic Medicine Anhui Medical University

The centrosome is the microtubule-organizing center and a crucial part of cell division. Centrosomal RNAs(cnRNAs) have been reported to enable precise spatiotemporal control of gene expression during cell division in many species. Whether and how cnRNAs exist in C. elegans are unclear. here, using the nuclear RNAi Argonaute protein NRDE-3 as a reporter, we observed potential peri-centrosome localized small interfering(si)RNAs in C. elegans. NRDE-3 was previously shown to associate with pre-mRNAs and pre-rRNAs via a process involving the presence of complementary siRNAs. We generated a GFP-NRDE-3 knock-in transgene through CRISPR/Cas9 technology and observed that NRDE-3 formed peri-centrosomal foci neighboring the tubulin protein TBB-2, other centriole proteins and pericentriolar material(PCM)components in C. elegans embryos. The peri-centrosomal accumulation of NRDE-3 depends on RNA-dependent RNA polymerase(RdRP)-synthesized 22G siRNAs and the PAZ domain of NRDE-3, which is essential for siRNA binding. Mutation of eri-1, ergo-1, or drh-3 significantly increased the percentage of pericentrosome-enriched NRDE-3. At the metaphase of the cell cycle, NRDE-3 was enriched in both the peri-centrosomal region and the spindle. Moreover, the integrity of centriole proteins and pericentriolar material(PCM) components is also required for the peri-centrosomal accumulation of NRDE-3. Therefore, we concluded that siRNAs could accumulate in the pericentrosomal region in C. elegans and suggested that the peri-centrosomal region may also be a platform for RNAi-mediated gene regulation.

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指向课程协同育人的跨学科主题学习路径设计

教学与管理 2025年第2期 24-28页

作者：殷凤张慧上海市浦东教育发展研究院上海200127 上海市浦东新区高桥镇小学上海200137

核心素养体系本身关注的是综合性素养,以落实“培养什么人”的教育目标。加强课程综合,注重关联,开展跨学科主题学习,强化课程协同育人功能,是新一轮课程改革的重要指向。以关联内容结构、融通核心素养、创设进阶活动、落实以评促学作... 详细信息

核心素养体系本身关注的是综合性素养,以落实“培养什么人”的教育目标。加强课程综合,注重关联,开展跨学科主题学习,强化课程协同育人功能,是新一轮课程改革的重要指向。以关联内容结构、融通核心素养、创设进阶活动、落实以评促学作为跨学科学习设计的路径,精准把握跨学科学习的取向,避免学科间的简单“拼盘”,从而真正实现课程的协同育人。

关键词：跨学科主题学习协同育人核心素养

CELLULAR SPACING SELECTION OF Al-0.53wt%Zn ALLOy UNDER NEAR-RAPID DIRECTIONAL SOLIDIFICATION CONDITION

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 320-324页

作者： J.feng W.D.huang X.Lin T.Li y.F.Xue y.h.Zhou Northwestern Polytechnical Univ Xi'an China

In order to investigate the response of cellular spacing to the variation of growth velocity under near-rapid directional solidification condition, Al-0.53wt%Zn alloy is directionally solidified with Bridgman apparatus. The results show that at the given temperature gradient the obtained microstrvctures are all cells and there exists a wide distribution range of cellular spacing. The maximum, λmax, minimum, λmin, and average cellular spacing, λ, as functions of growth rate, V, can be given by λmax=948.51V-0.4961, λmin= 661.16V-0.5015 and λ=412.41V-0.5049, respectively. The experimental results are compared with that predicted by KGT model, and a good agreement is found. Moreover,it is found that the average cellular spacing is also remarkably.h.story-dependent.

关键词： Al-Zn alloy near-rapid directional solidification cellular spacing history-dependence

Microplastic and nanoplastic exposure and risk of diabetes mellitus

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World Journal of Clinical Cases 2025年第3期13卷 24-29页

作者： hui-yi hsiao Chung-yi Nien Ruei-feng Shiu Wei-Chun Chin Tzung-hai yen Department of Biomedical Sciences College of MedicineChang Gung UniversityTaoyuan 33302TaiwanChina Center for Tissue Engineering Chang Gung Memorial HospitalLinkouTaoyuan 33305TaiwanChina Department of Life Sciences National Central UniversityZhongli 320317TaoyuanTaiwanChina Center of Excellence for The Oceans Taiwan Ocean UniversityKeelung 20224TaiwanChina Institute of Marine Environment and Ecology Taiwan Ocean UniversityKeelung 20224TaiwanChina Department of Chemical and Materials Engineering University of California MercedMercedCA 95343United States Department of Nephrology Clinical Poison CenterChang Gung Memorial HospitalLinkou 33305TaoyuanTaiwanChina School of Traditional Chinese Medicine College of MedicineChang Gung UniversityTaoyuan 33302TaiwanChina

The issue of plastic pollutants has become a growing *** microplastics(MPs)(particle size<5 mm)and nanoplastics(NPs)(particle size<1μm)can cause DNA damage,cytotoxicity,and oxidative stress in various *** primary kno... 详细信息

The issue of plastic pollutants has become a growing *** microplastics(MPs)(particle sizeytotoxicity,and oxidative stress in various *** primary known impacts of microplastic/nanoplastic are observed in the liver and respiratory system,leading to hepatotoxicity and chronic obstructive pulmonary *** research on the effects of MPs and NPs on diabetes is still in its early stages,there are potential *** editorial highlights the risk to diabetics from co-exposure to contaminants and MPs/NPs,supported by evidence from animal studies and the various chemical compositions of MPs/NPs.

关键词： Microplastics Nanoplastics Plastic pollution,Diabetes mellitus Insulin resistance

人工智能与政治安全形态演变:一项系统研究的尝试

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国际安全研究 2025年第1期43卷 54-72,156,157页

作者：封帅薛世锟上海国际问题研究院网络空间国际治理研究中心上海国际问题研究院上海200233

在人工智能时代,政治安全的内涵正在被不断深化和持续拓展,各国面临的政治安全风险也愈发复杂。根据系统科学理论,政治安全可以构建为一种政治安全系统,包含正反要素、四大结构面与动态稳定的功能。人工智能在经历从游离到输入的时序过... 详细信息

在人工智能时代,政治安全的内涵正在被不断深化和持续拓展,各国面临的政治安全风险也愈发复杂。根据系统科学理论,政治安全可以构建为一种政治安全系统,包含正反要素、四大结构面与动态稳定的功能。人工智能在经历从游离到输入的时序过程后,作为一种新的要素与政治安全系统发生互动。人工智能与政治安全的互动遵循“技术—应用—风险—系统”的逻辑过程,并实现对系统内其他要素的影响。这种影响全面且深刻,使得人工智能开始大面积嵌入政治安全系统,重构了政治安全结构。政治安全正在面临人工智能所带来的更复杂的风险形态,包括权力安全、制度安全与价值安全在内的政治安全内部生态都将发生深刻变化,推动整个政治安全形态经历深刻的变革。

关键词：人工智能政治安全国家安全系统科学

Effect of Organosilicon Coating Containing Light Stabilizer on UV Aging Resistance of Bitumen

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武汉理工大学学报 2010年第17期32卷 83-88页

作者： hUANG y feng Z G yU J y Key Laboratory of Silicate Materials Science and Engineering of Education Ministry Wuhan University of TechnologyWuhan 430070China

Effects of organosilicon coating with light stabilizer UV326,UV531 and 770 on ultraviolet (UV) aging resistance of bitumen were investigated by testing the viscosity,softening point and the changes of chemical component before and after UV aging. The results show that UV aging resistance of bitumen is improved due to the good weatherability of organosilicon. And the UV aging resistance of bitumen is further enhanced by adding light stabilizer into organosilicon coating due to the good UV absorption of light stabilizers. Bitumen coated with organosilicon coating containing UV326 exhibits better UV aging resistance in comparison with bitumen coated with organosilicon containing UV531 or 770.

关键词： bitumen light stabilizer organosilicon coating UV aging

A Special Kind of Interplanetary Coronal Mass Ejection

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Research in Astronomy and Astrophysics 2024年第12期24卷 185-193页

作者： h.Q.feng y.Zhao G.Q.Zhao h.B.Li L.Xiang J.M.Wang Institute of Space Physics Luoyang Normal University henan Key Laboratory of Electromagnetic Transformation and Detection Luoyang Normal University

It is generally believed that coronal mass ejections(CMEs) have magnetic flux rope structures because of their helical shapes. however, only about 30%–40% of interplanetary CMEs(ICMEs) have a local magnetic flux rope structure. The usual explanations are that the spacecraft only crossed the flank of the ropes and failed to detect the complete magnetic flux rope structure or that some processes destroyed these magnetic flux rope structures. Several studies suggest that some ICMEs inherently possess disordered magnetic fields and consequently exhibit no magnetic flux-rope structures. We introduce a special kind of ICME which has a low magnetic field magnitude and stable magnetic field direction, relatively fast expansion speed, and lower proton temperature and density. All three of the measured magnetic field components are relatively stable. We want to know whether these ICMEs also have magnetic flux rope structures or not. We identified 20 special ICMEs and analyzed their evolution based on their observed characteristics. We took a special ICME as an example, which had an apparent rope configuration at 1 au but evolved to a special ICME at 5.4 au, to illustrate that this kind of ICME could come from magnetic clouds(MCs) whose rope structure had been being stretched due to expansion. We inferred that the missing obvious flux rope structure may be due to the expansion of MCs, not the flank crossing effect. however, more than 50% of the events were associated with the dominant x-component of the magnetic field, which indicates a leg ***, the detection of part of these special ICMEs may also be the result of the leg-crossing effect.

关键词： (Sun:) solar wind interplanetary medium Sun: coronal mass ejections (CMEs)

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侵犯商业秘密罪评价标准的修正与规范解读

海南大学学报（人文社会科学版） 2025年第1期43卷 185-194页

作者：冯明昱张勇南京师范大学法学院江苏南京210023 华东政法大学刑事法学院上海200042

《刑法修正案(十一)》完成了侵犯商业秘密罪由数额犯到情节犯的全面转型,但未跟进更新的司法解释易使得司法实务将情节犯作数额犯化处理,仅关注数额要素对于犯罪评价的影响。侵犯商业秘密罪所保护的是复合法益:一是商业秘密权利人对商... 详细信息

《刑法修正案(十一)》完成了侵犯商业秘密罪由数额犯到情节犯的全面转型,但未跟进更新的司法解释易使得司法实务将情节犯作数额犯化处理,仅关注数额要素对于犯罪评价的影响。侵犯商业秘密罪所保护的是复合法益:一是商业秘密权利人对商业秘密享有的私权利,二是市场竞争秩序,后者又可还原为具体的个人法益——商业秘密权。以此为逻辑起点,侵犯商业秘密罪的评价体系应当坚持区分性、形式与实质相统一、强保护的原则,建构综合评价体系。各要素不可单独作为入罪标准,而应综合考量,建构起以数额要素为主,非数额要素为辅的“情节严重”解释体系。

关键词：侵犯商业秘密罪情节犯数额犯